Doubting that anyone measured just the filon length unless they reroofed, however fairly certain that Mr. Lufkin would get that for you. Good thing that at his age he would not have to go vertical to get it as the seams are not perpendicular. The only question at that point would be SAE or Metric?
Welcome to Lake Wobegon where Justin and David utilize abductive reasoning to help solve F/SS issues.
Happy Trails and Remember the Pequod.